it is best to avoid windows 10 right now, but i don't think this is the case, of the first hacking attempt from microsoft, so it most likely that you were infected
you visited a shady website or probably downloaded something malicious, in other words it's your fault
What about the passwords?
I've never entered them on Windows 10
You had quite a considerable amount. Have you ever revealed how many bitcoins you have publicly, on any forum for example? This would make you a much easier target. Hackers would be able to target you by your IP address.
The truth of the matter is that these Bitcoin targeting malwares are and will be more and more numerous in the future.